<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
<form action="check.php" method="post">
    账号：<input type="text" name="username"><br/>
    密码：<input type="password" name="password"><br/>
    <button type="submit">登录</button>
</form>
</body>
</html>